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k = 1/2 * 3,14 * d besar + 1/2 * 3,14 * d kecil + 8
= 1/2 * 3,14 * 16 + 1/2 * 3,14 * 8 +8
= 25,12 + 12,56 + 8
= 45,64
L = 1/2 * 3,14 * r kuadrat lingkaran besar - 1/2 * 3,14 * r kuadrat lingkaran kecil
= 1/2 * 3,14 * 8*8 - 1/2 * 3,14 * 4*4
= 100,48 - 25,12
= 75,36